From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0C9AACA9ED3 for ; Mon, 4 Nov 2019 22:26:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CC46B204EC for ; Mon, 4 Nov 2019 22:26:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572906389; bh=6YTxUo/vV96WT4vAvISg0yT5ieDjpadh9376XMiWhpQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=bSQMM5QUhw7kNn3yVlmBQvP3REXDSE6kutamrzP42QxpCj2k9JZJJZIpJf9sg1HYA zSvwVEh9eI9CEz1QInPh0VXYi0p+ahjy8JgHfACJugbPYxjeGz54NPaZFma94WX2Yj u2LIfke3fSJyYFIq6sB1kxZCZ8IMp324aAdPxZcE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730302AbfKDW0Y (ORCPT ); Mon, 4 Nov 2019 17:26:24 -0500 Received: from mail.kernel.org ([198.145.29.99]:44132 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730459AbfKDVvO (ORCPT ); Mon, 4 Nov 2019 16:51:14 -0500 Received: from localhost (6.204-14-84.ripe.coltfrance.com [84.14.204.6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E13DB2190F; Mon, 4 Nov 2019 21:51:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572904274; bh=6YTxUo/vV96WT4vAvISg0yT5ieDjpadh9376XMiWhpQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aMF5ALdM8GruoG4wdi3lQfnLfGzPuD0xCg88o7mUdkcYqa+lgvAkReW9VbZXim05z neYTviVtq8jeoiRcdDVjhm0aJT2zN598HwueaDB8424NyTs/Pbz1rCB5nH0jPETans 6ewphMpv0fIJ5WrJlFmx3IDaWkoRBs6w2kONefe0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Adam Ford , Yegor Yefremov , Sasha Levin Subject: [PATCH 4.9 20/62] serial: mctrl_gpio: Check for NULL pointer Date: Mon, 4 Nov 2019 22:44:42 +0100 Message-Id: <20191104211920.945305962@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191104211901.387893698@linuxfoundation.org> References: <20191104211901.387893698@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Adam Ford [ Upstream commit 37e3ab00e4734acc15d96b2926aab55c894f4d9c ] When using mctrl_gpio_to_gpiod, it dereferences gpios into a single requested GPIO. This dereferencing can break if gpios is NULL, so this patch adds a NULL check before dereferencing it. If gpios is NULL, this function will also return NULL. Signed-off-by: Adam Ford Reviewed-by: Yegor Yefremov Link: https://lore.kernel.org/r/20191006163314.23191-1-aford173@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/serial_mctrl_gpio.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index d2da6aa7f27d0..1bb15edcf1e77 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -68,6 +68,9 @@ EXPORT_SYMBOL_GPL(mctrl_gpio_set); struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, enum mctrl_gpio_idx gidx) { + if (gpios == NULL) + return NULL; + return gpios->gpio[gidx]; } EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod); -- 2.20.1